Okay so I am thinking instead of the usual hijack, all xenos pile on the dropship, that we have now it could be something like: The queen calls the dropship down, when it lands the queen mother's screechy thing plays and tells the queen to go to the cockpit and activate the dropship before needing to get off, the queen gets off, the dropship heads skywards towards the almayer, as the queen mother helped the queen alter the programming to make it crash. ARES sounds an alert "Dropship [x] is on collision trajectory. Warning, engines not made ready, unable to avoid impact. Seek emergency shelters immediatly." the dropship hits after a short time and damages ARES's system which can spout out some corrupted message. The emergency warning system comes online "Warning, critical AI failure, a deorbit event is imminent, evacuation protocols active. Seek reinforced shelter incase of evacuation malfunction." - this begins to play https://youtu.be/EO9x0y5lqD0?t=365 [Volume warning] - smoke and steam start firing out from pipes at random spots [just visual] as a sign the ship is falling apart. The countdown is serving as an impact estimation.
The Almayer hits planetside, somewhere near the middle of each map, only bits of the ship are 'intact' and those would be the reinforced sections, the rest has been sheered away, there is no upper or lower deck anymore, just scattered bits of compartments that survived deorbit. Marines can search the wreckage for escape pods which can launch them into orbit to escape, or find the damaged dropship and do minor repairs to evacuate a mass number of them into orbit. Marine defenses would be thrown together from whatever they gathered during the deorbit crisis.
I apologize if this isn't super fleshed out yet, I will go into more detail later, for now I just wanted to get it down and then work on picking through it to make it a full on event.